A built$-$up beam has the following cross section: where x$=8$cm Enter decimal values for all numbers.For the following figure, calculate the A d$^2$ for each rectangle by Parallel Axis Theorem. the next part.$)$ The A d$^2$ for each rectangle is as follows: $[$ A d$^2$ for piece $1=$ cm$^4$; A d$^2$ for piece $2=$ cm$^4$; A d$^2$ for piece $3=$ cm$^4]$Required information

NOTE: This is a multi$-$part question. Once an answer is submitted, you will be unable to return to this part.

A built$-$up beam has the following cross section:

where $x=4cm$

The given cross section appears to be composed of rectangles. There are a variety of ways to break up the cross section into rectangles, but only one is

most efficient. How many rectangles exist in the most efficient subdivision scheme? $($You must provide an answer before moving to the next part.$)$